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Australian Bass, Macquaria novemaculeata (Steindachner, 1866)

Scientific name:Macquarianovemaculeata

Alternative name/s:
Freshwater perch, Eastern Freshwater Perch, Perch

Similar species:
Four species of Macquaria are recorded from Australia. The Estuary Perch, Macquaria colonorum, looks similar to the Australian Bass, but has a longer snout which is concave in profile. The Macquarie Perch, Macquaria australasica, has a rounded to truncate caudal fin and jaws of equal length in larger specimens. The Golden Perch, Macquaria ambigua, can be recognised by its protruding lower jaw and the strongly concave head profile of larger specimens.

Fast Facts

It grows to 60 cm (3.8 kg) in length, but fishes of 35 cm (1 kg) are more commonly seen.

Introduction

Often found far upstream in freshwater, the Australian Bass eats fishes, crustaceans and other invertebrates such as insects. It is a very popular recreational angling species.

Identification

The Australian Bass can be recognised by a combination of characters including an evenly arched dorsal profile, a snout that is straight or slightly concave and a forked caudal fin. It has a protruding lower jaw, moderately large eyes and a notch between the spiny first dorsal fin and the soft-rayed second dorsal fin.

The species is dark olive-green or greyish on the back and sides with darker scale margins. The belly is silvery or whitish, and the fins are mostly dusky brown to black. The tips of the anal and pelvic fins are white. Juvenile fish under 12 cm long are banded and have a dark blotch on the gill cover.

Habitat

In recent years, population sizes have declined as building of dams and weirs has made potential habitats inaccessible. River regulation is reported to interfere with spawning cues.

Distribution

It is recorded in coastal rivers, lakes and estuaries of eastern Australia from Fraser Island, Queensland to Wilson's Promontory, Victoria.

It can migrate considerable distances upstream and has been historically recorded up to an altitude of 600 m in the Hawkesbury River drainage, New South Wales.

The map below shows the Australian distribution of the species based on public sightings and specimens in Australian Museums. Source: Atlas of Living Australia.

Feeding and diet

The Australian Bass eats fishes, crustaceans and other invertebrates such as insects.

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